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16
Home Made / Re: gasr' build questions.
« on: November 14, 2012, 08:42:39 AM »
Cross sectional area. My (
2" ID flues will have a total of 25.12", these will feed a chimney outlet of (6") 28.26. My main question is would say is will ( 2" flues support the Btu output of a 6" stack assuming it is in a forced draft situation? Is there a way to figure mass air flow of a gasification furnace at a given Btu or #/hr of wood burned. I assume it would be fairly long equation as you have heating and cooling at different stages of the furnace. I dont want to put the work into this unit and have it be a pig, but I also dont want to dig so far into every detail that I research for 2 more years. I started forming the transition boxs yesterday. I would like to start cutting the flue sheets tonight, assuming the 2" flues will work.
2" ID flues will have a total of 25.12", these will feed a chimney outlet of (6") 28.26. My main question is would say is will ( 2" flues support the Btu output of a 6" stack assuming it is in a forced draft situation? Is there a way to figure mass air flow of a gasification furnace at a given Btu or #/hr of wood burned. I assume it would be fairly long equation as you have heating and cooling at different stages of the furnace. I dont want to put the work into this unit and have it be a pig, but I also dont want to dig so far into every detail that I research for 2 more years. I started forming the transition boxs yesterday. I would like to start cutting the flue sheets tonight, assuming the 2" flues will work.
17
Home Made / Re: gasr' build questions.
« on: November 14, 2012, 05:45:18 AM »
Being forced draft are we limited by the flue out let size? I was planning on ( 2" flues out of the secondary but that is only 24.8" and a 6" flue is 28.26 or about 13% smaller. Does the FD make that a none issue?
2" flues out of the secondary but that is only 24.8" and a 6" flue is 28.26 or about 13% smaller. Does the FD make that a none issue?
18
Home Made / Re: gasr' build questions.
« on: November 13, 2012, 05:34:26 AM »
As I am still in the drawing stages I have to make a few assumtions and Im sure my math is off abit. My question is can I achive complete combustion in the secondary firing 150,000 btu in a 50" tunnel? I see some commercial units make the path longer while others have a fairly compact chanmber. That should burn 22# of wood/hr and need 37CFM of air to make happen. I have a 120 CFM radial blower to use. Would 2" ball valves be usefull for air metering? The actuator and fan arrived by Big Brown yesterday. Also picked up the 10 ga. for the tank walls and the flue material.
19
Home Made / Re: Start of ultra high efficiency gasifier boiler build
« on: November 12, 2012, 11:36:02 AM »
Let me post a big thank you to peacmar!! I am glad to see a person put so much effort into a build like this then also log and document the process. While I could build a furnace without the internet or knowlage gained here it would be an ifferior unit as I have gained much from this board and its members. I hope the attempted theives are outed and that company black listed from our good graces. Thank you again for sharing the knowlage and skill. 
20
Home Made / waterside paint/coatings?
« on: November 12, 2012, 08:29:35 AM »
Is anybody painting the water side of their tanks? Im specifically looking at the zone above the water level. The steel in that area is seeing very damp air at all times. Seems it would breed rust. I was thinkiing of flooding the tank and just using a stand pipe for level but that may not work real well. Is it an issue or am I over thinking? I had planned on making the top of the tank removable. The tank would have a 1.5" angle welded in place and the actual tank top would bolt on with RTV seal.
21
Home Made / Re: gasr' build questions.
« on: November 12, 2012, 08:22:36 AM »
Thank you for the answers. Can I assume that if I can fashion a swirling nozzle that it would help mixing in the secondary and should promote better burn? I am taking delivery of a small radial blower today to play with and see how well it performs. After I get a feel for the curve of this fan I can find out how many inchs of water it can develop and start looking at nozzle sizing. 33 FPS seems pretty quick.
22
Plumbing / Re: Getting ready to plumb: Feed & return question
« on: November 09, 2012, 07:20:38 AM »
When building mine I plan to place the pumps low but have a stand pipe inside to bring the suction up off the bottom. My reasons are two fold. With it off the bottom if you ever lost a pipe in the house you only empty a % of the total in the furnace. Also if you lost water you would not distroy the furnace from pulling the water down below the firebox. You maintain the head pressure on the pump by their physical placment not from the point they draw water. So long as the suction pipe is flooded the head the pump sees is the same as if it were tapped straight into the water jacket.
23
Electronics / Re: Mechanical Timer for Blower
« on: November 06, 2012, 12:43:04 PM »
A timer may work but it would not be so automatic or efficient. I would think a second temp contol would be better if you can swing it. You would then have a low temp that starts the fan and a low low that turns it off. Multi-step alarms are not uncommon. Might take some tuning to get the spread right but I would think 5 deg should due.
25
Home Made / gasr' build questions.
« on: November 05, 2012, 11:44:19 AM »
In laying out the gas path for my unit I was thinking of a reason why I could not have the gas port in the floor of the primary in the front (toward the door) of the chamber opposed to the back that I see most of the time. This would allow the secondary chamber to be unidirectional. All the flue gas would flow to the back and not have to make a loop. With 5' of secondary chamber I would hope all the combustion has happend by then. Should primary air come in high and away or close into the wood? The upper rear of the primary would give all the wood a chance to burn opposed to only the wood closest to the nozzle using all the air with an in the bed manifold. Secondary air would route low almost through the fire bed to the front of the secodary chamber and blow back to the rear of the unit toward the first pass heat exchanger.
Is 48" to long of a firebox? Figured I would just fold up a sheet and make my dimentions fit that but if its to deep I can shorten it before its broke. Would a radial blower work better for air supply? The high pressure of a radial would help secondary mixing and burn I would think.
Is 48" to long of a firebox? Figured I would just fold up a sheet and make my dimentions fit that but if its to deep I can shorten it before its broke. Would a radial blower work better for air supply? The high pressure of a radial would help secondary mixing and burn I would think.
26
Home Made / Re: Start of ultra high efficiency gasifier boiler build
« on: November 02, 2012, 01:14:48 PM »
Looking at the photos this appears to be a single pass set-up? Are the 2nd-3rd passes on units like the P&M not worth the cost for the heat extracted?
27
Home Made / Re: Start of ultra high efficiency gasifier boiler build
« on: October 19, 2012, 05:36:15 AM »
Gald to see you are not stuck on this burner project. Some times a little side trip can keep you from getting bogged down in a project. Nice bugs on the aftercooler!!!
28
Home Made / Re: Start of ultra high efficiency gasifier boiler build
« on: September 26, 2012, 08:31:42 AM »
Nice work thus far. Any chance of seeing a few dimensions along the way? Also on the secondary chamber, whats the channel on the side? Secondary burn air duct?
29
Home Made / Re: Gasification wood boiler build
« on: October 10, 2011, 05:14:17 AM »
Did you add any lay-up chemicals to the waterside? I have the plates all drawn up and am waiting on the shop to brake them. I have an old 1000 gallon fuel oil tank. It was removed from service and did not leak. Thinking of using that for the outer tank. I kind of torn, reuse a tank that is water tight and already made. But the issue is what if it has a few pin holes in the making that I cant find and they open up later. Now everything is built around a tank that is no good. Im thinking of just spending the coin and building a real tank.
30
Home Made / Re: Gasification wood boiler build
« on: September 29, 2011, 07:42:38 AM »
Why is it the gas chambers are on the bottom? Seems you are fighting the air and heat wanting to rise. Must be a real reason as that seems to be the way it is done by most.